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United States Patent | 5,193,393 |
Czarnocki | March 16, 1993 |
A pressure sensor circuit (10A) is disclosed which preferably utilizes a piezoresistive pressure transducer (11A) having a substantial temperature coefficient of resistance to provide an inherent temperature variation which is used to implement offset temperature compensation for the circuit. Two operational amplifiers (OA1, OA2) are configured along with selectable resistors (R.sub.1, R.sub.9, R.sub.7, R.sub.8, R.sub.5, R.sub.6 and R.sub.4) to implement four adjustments of the circuit (10A) to adjust span (gain), offset and temperature variation of both span and offset to achieve a desired result. All this is achieved while implementing a common mode gain for the circuit (10A) which is less than 5 and preferably no more than 2.
Inventors: | Czarnocki; Walter S. (Schaumburg, IL) |
Assignee: | Motorola, Inc. (Schaumburg, IL) |
Appl. No.: | 653197 |
Filed: | February 4, 1991 |
Current U.S. Class: | 73/708; 73/766; 73/862.623; 324/105; 324/721 |
Intern'l Class: | G01L 019/04; 862.67 |
Field of Search: | 73/706,708,717,718,719,720,721,722,861.47,862.35,862.48,862.58,862.63,862.65 338/3,4 324/105,721 |
4798093 | Jan., 1989 | Kenoun | 73/708. |
Nippondenso PRT Circuit Schematic. Delco PRT Circuit Schematic. Motorola PRT Circuit Schematic. |